The most important reason why building codes exist is for safety. The buildings have been abandoned for some time and are likely in deep disrepair. It seems the city wants to know that if their children go to the science museum, it won't collapse or burn down. This guy is not an architect or engineer, and hasn't even hired one. If the city had building codes but didn't enforce them, and some tragedy happened, they might even be liable legally. They would definitely be liable politically if a big tragedy happened.
Also—like other people have said, if the city are assholes, that sucks, but he’s still going to be fighting a steeper uphill battle on his plans and investments without them behind him—suck it up and learn to work with them or it’s going to be that much harder to not only get started on his current plans, but also his longer term plans of revitalization.
Maybe a great piece of software can be built as a single person working alone, fighting the odds and pissing people off, but I can’t see that approach working for building a town full of people.
IMO this is not a case of a nimby board standing in the way of an eccentric trying to innovate. The problem is that he has made himself known to this board as an unserious crank who does not show the board respect for their processes. He has been approved for several different uses at the site and failed to follow through on any of them. He demands special permissions while actively campaigning against their plans. If he could show a good faith effort to help the town build upon what the electeds are doing he might have a fighting chance, but he instead goes around talking shit about them anywhere he can.
For a less hypothetical scenario, its not hard to see the parallels with another wacky entrepreneur and a submarine that eschewed traditional safety concerns
Building codes, like several other categories of regulations that can at times feel oppressive or arbitrary, tend to be written in the blood of accident victims. See, for example the ghost ship fire in my recent memory of why they are important even if (especially if) you are using an under utilized space
Another notable quote is Euclid v. Ambler, where SCOTUS legalized the US zoning system and in their opinion said it was good to ban apartment buildings because they were "parasites".
Of course, this is partly about not liking poor people as well as minorities, but if you leave it in place this long it eventually becomes a ban on your own children living in the same state as you.
These things were introduced at the same time as racial convenants (where a developer would construct a neighborhood and require its houses to only ever be sold to white people), and mostly for the same reason; they merely weren't repealed when that one was. For the racial details, see the book "The Color of Law".
Maybe it's just because I don't live in a depressed area like this, but I simply don't understand the city's motivation for being a pain in the ass here. I mean, pretend you're the mayor or city council of this town. Industry has left. The jobs have left. Your schools suck. The state and country is ignoring you. Your citizens are spiraling into poverty, drugs, and crime. A wacky entrepreneur moves in, and would like to take a shot at revitalization.
And you're worried about architectural drawings and building codes?????
Even if the guy is has weird ideas, why would you make it your job to get up his ass when he appears to at least be trying to do something positive?
It's hinted in the article that the local government has its own (lame) revitalization plans, which will also not work, and sees this guy as competition. So silly. No wonder it sucks living in these hopeless places.